Cylinder-grinding attachment for lathes



F. 1. ROBERTSON, AND w. s. PETERSON. CYLINDER GRINDING ATTACHMENT FOR LATHES' APPLICATION FILED JULY 2,1919. I

Patented Apr. 18, 1922;

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- APPLIOATION FILED JULY 2,1919. 1,41 3,061. Pat nt d Apr.v 1922.

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FRANK J. ROBERTSON AND WALTER s. PETERSON, or DENVER, COLORADO.

CYLI N'DER-GRINDING ATTACHMENT FOR LATI-I'ES.

Specification of Letters Patent.

Patented Apr. 18, 1922.

Application filed. July 2, 1919. Serial No. 308,083.

Be it known that we, FRANK J. RoBERTsoN and WALTER S. PETERSON, citizens of the United States, residing at Denver, in the county of Denver and State of Colorado,have invented certain new and useful Improvements in Cylinder-Grinding Attachments for Lathes; and we do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to certain new and useful improvements in grinders. V

The primary object-of the invention is to provide a grinder for engine cylinders which can be. easily attached to ordinary lathes without first specially adapting the lathe for the reception of the same.

Another object of the invention is to improve upon devices of this class by providing a rigid and nonvibrating mounting for the grinder.

Another object of the invention is to provide a device of thischaracter which will be comparatively simple, strong, durable and inexpensive in construction, efficient and reliable in operation, and well adapted to the purpose for which it is designed.

With these and numerous other objects in view, the invention resides in certain novel features of construction and the combination and arrangement of parts as will be hereinafter fully described and claimed.

In the accompanyingdrawings forming a part of the application and in which similar reference characters designate like parts throughout the several views, a I

Fig. 1 is a side elevation of adevice constructed in accordance with this invention, showing the same attached to a lathe.

Fig. 2 is a top plan view of the device.

Fig. 3.is acentral vertical sectional view through the device. 7

Flg. 41 is an end view of the same, and Figs. 5 and 6 are transverse sectional vlews taken on the planes indicated by the lines 5-5 and 6- 6 of Fig. 3.

Referring more particularly to the drawings, the numeral 1 designates. a mandrel which issubstantially cylindrical in shape and has recesses 2 cut in its ends to provide for the reception of the centersof a lathe. One side of the mandrel 1 is cut away as at 3 and in the recess so formed is disposed a block 4: provided withtwo or more bearings 5 for the shaft 6. of a grinder 7. The block 4: has a slidable movement in and out of the recess 3 to provide adjustment ofthe axial relation of the shaft 6 with the axis of the mandrel 1, this adjustment being secured by means of adjusting screws 8 which extend transversely through the mandrel 1 and being malntained by means of set screws 9, the latter also extending transversely through the mandrel at right angles to the screws 8 side of the block 1. i

The invention is so constructed as to cause the rotation of the grinder to be automatically effected by the rotation of the mandrel 1. The power applied to the mandrel and having their inner ends abutting one through the agency of the rotary headstock and dog 14 thusserves to rotate the mandrel and to simultaneouslyimpart a separate rotative motion to the grinder responsive to the rotation of the mandrel. This obviates the necessity of a separate belt or other power transmitting agent such as is commonly used and makes for the simplicity and attractiveness, as well as the effectiveness of operation, of the machine. The driving means which I employ is well adapted to the structural features of the machine and effectively cooper ates with the grinding mechanism to form a compact and highly eflioient device, of sim- V ple and convenient design.

At one end of the mandrel l is a laterally extending lugflO having mounted on. its outer end the shaft 11 of a pinion 12. The

inner end of theshaft 11 is connected by a section of flexible shafting 13 to the adj acent end of the shaft 6 so as to impart-rotary motion from the pinion 12 to the grinder, but it is to be understood that other means for accomplishing this result may bev employed. y

In applying the device to a lathe the mandrel 1 is placed between the centers of the lathe as shown and is driven from the rotating headstock thereof by means of a dog 14. Fixed to some immovable part of the tailstock of the lathe is a large gear wheel '15, the latter beingplaced so that the pinion 12 will mesh with it and form a planetary means for driving the grinder. The: proper speed ratio between the grinder and the mandrelmay be obtained by a proper. selection of the gearing between the grinder and he lathe, or in the present instance by prop erly selecting the sizes of the gear wheel and pinion 12.

In using the invention the axial relation between the grinder and the mandrel is first adjusted to suit the diameter of the cylinder to be ground and then the mandrel is inserted through this cylinder. The mandrel is then placed in driving relation between the centers of the lathe and the cylinder is clamped in position in any suitable manner. The device may be used for grinding a tapered hole by using the taper attachment provided for the lathe.

From the foregoing description, taken in connection with the accompanying drawings, the construction and operation of the invention will be understood. It will be seen that inasmuch as the mandrel is rigidly mounted between the centers of the lathe and the grinder has its shaft mounted in two or more bearings, there is little danger of vibration during operation. Furthermore, the device is suitable for use in various kinds of shops as it can be easily attached: tosmall or even large lathes without first adapting the lathes for the attachment.

We claim:

1. The combination of a mandrel mounted between the centers of a lathe and provided at one end with means for driving said mandrel from the headstock of the lathe, a grinder mounted upon said mandrel, and means at the other end of said mandrel actuatable by the tailstock of the lathe for rotating said grinder on its axis.

2. The combination of a mandrel mounted between the centers of a lathe and provided at one end with means for driving it from the headstock thereof, a grinder mounted upon said mandrel, a pinion also mounted upon the mandrel and having connection with said grinder, and a gear wheel fixed to the tailstock'of the lathe and meshing with said pinion to form a planetary means for driving the grinder.

3. A grinding device comprising a mandrel adapted to be rotatively mounted in a lathe, a grinder rotatively mounted on said mandrel, means for rotating said mandrel, a stationary gear fixed to the lathe, and means carried by said mandrel constructed to con tinuously engage said stationary gearas said mandrel rotates, for rotating said grinder" on its axis.

4. The combination of a mandrel mounted between the centers of a lathe and provided at one end with means for driving it from the headstock thereof, said mandrel having a recess in one of its sides, a block slidably mounted in said recess for movement in and out of the same, means for adjusting the position ofsaid block and holding it in adjusted position, a grinder journaled in said block, and means for 1 driving said grinder.

5. fer lathes icomprising mandrel adapted to be mounted between the head and tail stock centers of a lathe and to be driven from the head stockthereof, said mandrel having a recess in one of its sides, a block slidably mounted in said recess for movement in and out of the same, means for adjusting the position of said block and hold ing it in adjusted position, a grinder journalled in said block, and planetary means for driving said grinder, said means including a member having means for attachment to the tail stock of the lathes.

6. An attachment for lathes comprising a mandrel adapted to be mounted between the head and tail stock centers of the lathe and to be driven from the head stock thereof, said mandrel having a recess in one of its sides, a block slidably mounted in said recess for movement in and out of the same, means for adjusting the position of said block and holding it in adjusted position, a grinder j ournalled in said block, a lug extendinglaterally from said mandrel at one end thereof, a pinion mounted. upon the outer end of said lug, a shaft connecting said pinion with said grinder to rotate the latter, and a gear wheel around which said pinion has a planetary movement, said gear wheel being provided with means for. attachment to the tail stock of the lathe. V

7; In a grinding device, the combination of a mandrel adapted to be mounted between the centers of a lathe, means for rotating said mandrel, a grinder carried by said mandrel and mounted to rotate relative thereto, and means for rotating said grinder in response to rotation of said mandrel.

8. In a grinding device, the combination of a mandrel adapted to be rotatively mounted in'a lathe, a grinder rotatively mounted in said mandrel, means for rotating said mandrel, a stationary abutment, meanscarried by said mandrel constructedto continuously engage said abutment as said mandrel rotates for rotating said grinder.

9. Ina grinding device, the combination of a mandrel adapted to be rotatively mounted in a lathe, a shaft carried'by said 'mandrel and rotatable relative thereto, a

grinder on said. shaft, a fixed stationary gear, and a pinion carried by said mandrel and in operative connection with said shaft. said pinion being in mesh with said gear.

10. A grinding device comprising a man- 7 drel adapted to be rotatably mounted in a lathe, means for rotating the mandrel, a grinder carried by said mandrel substantially internally thereof and adjustable longi-tudinally of said mandrel, and means for drivin said grinder. v

11. grinding device comprising a man drel adapted to be mounted in a lathe, means for rotating said mandrel, a grinder mounted upon said mandrel substantiallyinten nally :thereoijmeans for adjusting theposi- 130 tion of the grinder both radially and longitudinally with respect to the mandrel, and means for driving said grinder.

12. A grinding device comprising a mandrel adapted to be mounted in a lathe, means for rotating said mandrel, a grinder shaft, a block slidably mounted in said mandrel and forming a support for said shaft, means for adjusting the position of the block radially of the mandrel, a grinder on the grinder shaft, and means for driving said shaft. g

13. A grinding device Comprising a mandrel adapted to be mounted in a lathe, said mandrel having an open-sided recess in its body, a block positioned in said recess and adjustable both longitudinally and radially of the mandrel, a grinder supported bysaid block, and means for driving said grinder.

14:. A grinding device comprising a mandrel supported at both ends, said mandrel having an open-sided recess in its body, a block positioned in said recess, said block having an open-sided recess for the reception of a grinder, a grinder shaft j ournalled in said block and movable therewith, means for adjusting the position of said block with respect to the mandrel, a grinder on said shaft ,said grinder lying substantially with in the recess in the block, and means for riving the grinder shaft.

15. In a grinding device, a block adapted to be inserted in and'supported by a mandrel and to form a support for a grinder,

' for rotating said mandrehsaid mandrel having an open-sided recess longitudinally of its body, a block adjustably positioned in said recess, a grinder shaft journalled in said block, a grinder on said shaft, a fixed gear, a pinion carried by said mandrel and in mesh with said gear,and a flexible connection between said pinion and said grindershaft.

18. A grinding device comprising a mandrel adapted to be mounted in a lathe,-

means for rotating said mandrel, said man drel having an open-sided recess longitudinally of its body, a block adjustably positioned in said recess, a grinder shaft journalled in said block, a grinder on said shaft, a driving member for said shaft, and a flexible connection between said driving mem her and said shaft.

In testimony whereof we have hereunto set our hands.

FRANK J. ROBERTSON. WALTER S. PETERSON. 

